Even if you poop in your fancy bungalow toilet, it does end up in the rivers, along with detergent and toxic toilet cleaners.

Banning disposable plastic and non biodegradable detergents would go a great way in letting microbes and plants do their job in cleaning up the environment.

With plastics not clogging up the rivers and chemicals not killing all river life, the rivers would definitely run much cleaner. This move was incidentally meant to curb air pollution, so clean rivers or oceans are an added benefit.